Analysis of p>129p>I in groundwater samples: Direct and quantitative results below the drinking water standard

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• 作者：Christopher F. Brown ; Keith N. Geiszler ; Michael J. Lindberg
• 刊名：Applied Geochemistry
• 出版年：2007
• 期刊代码：5_08832927
• 类别：ce
• 出版时间：March 2007
• 卷：22
• 期：3
• 页码：648-655
• 文件大小：145 K

摘要

This paper highlights an analytical method based on mass measurement that can be used to directly quantify p>129p>I in groundwater samples at concentrations below the maximum contaminant level (MCL) without the need for sample pre-concentration or extraction. Samples were analyzed on a Perkin Elmer ELAN DRC II ICP-MS after minimal dilution using O₂ as the reaction gas. Analysis of continuing calibration verification standards indicated that the dynamic reaction cell (DRC) mode could be used for quantitative analysis of p>129p>I in samples below the MCL (0.0057 ng/mL or 1 pCi/L). The low analytical detection limit of p>129p>I analysis in the DRC mode coupled with minimal sample dilution (1.02x) resulted in a final estimated quantification limit of 0.0051 ng/mL. Subsequent analysis of three groundwater samples containing p>129p>I resulted in fully quantitative results in the DRC mode, and spike recovery analyses performed on all three samples confirmed that the groundwater matrix did not adversely impact the analysis of p>129p>I in the DRC mode. This analytical approach has been proven to be a cost-effective, high-throughput technique for the direct, quantitative analysis of p>129p>I in groundwater samples at environmentally relevant concentrations that reach below the current MCL.